ぺちゃくちゃ

Etymology
Alteration from, an onomatopoeia for a large number of people talking noisily. The shift from initial to  changes the meaning from an emphasis on  to an emphasis on. Compare 🇨🇬,,.

Also analyzable as a compound of root elements:
 * : onomatopoeia for lively talking, evocative of the sound of lips and tongues smacking; also onomatopoeia for the sound of water splashing against something.
 * : onomatopoeia for the sound of paper crumpling; by extension, indicates that something is being done in a confused or disorganized fashion.

Adverb

 * 1) continuously and in a lively fashion

Related terms

 * : continuously and noisily
 * : continuously and in a lively fashion ; splashingly
 * : crumplingly, wrinklingly, in a confused or disorganized fashion
 * : all messed up